Question: 4 A ) . We sometimes need to find out how long it will take a sum of money ( or anything else ) to

4A). We sometimes need to find out how long it will take a sum of money (or anything else) to grow to some specified amount. For example, if a company's sales are growing at a rate of 20% per year, how long will it take sales to double?
4B). If you want an investment to double in 3 years, what interest rate must it earn?
4C). What are the future values of a 3-year ordinary annuity and annuity due of $100 if the appropriate interest rate is 10%?
4D) What is the effective annual rate (EAR or EFF%)? What is the EFF% for a nominal rate of 12%, compounded semiannually? Compounded quarterly? Compounded monthly? Compounded daily?

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